Hydrocarbon NGA/RGA Gas Analysis System Nexis GC-2030HNR2 GC-2014HNR2

Significance of the Topic

Accurate determination of hydrocarbon composition in natural gas and similar mixtures is essential for calculating key physical properties such as heating value and relative density. This information supports quality control in gas production, distribution, and end-use applications, ensuring safety and compliance with industry standards.

Objectives and Study Overview

This application note describes a gas chromatographic method employing a Shimadzu system (Nexis GC-2030HNR2 or GC-2014HNR2) to quantify components from methane (C1) through heavy hydrocarbons (C6+) within specified concentration ranges. The primary goals are to demonstrate method performance, achieve rapid separation of target analytes, and provide data for property calculations and mixture monitoring.

Methodology and Instrumentation

Sample introduction utilizes four loop injections directed through a 10-port valve. A pre-column traps and back-flushes C6+ components as a single peak, while C3–C5 hydrocarbons are separated on an alumina capillary column. Detection is performed using a flame ionization detector (FID). Total analysis time is approximately 10 minutes, optimizing throughput for routine laboratory workflows.

Used Instrumentation

• Gas chromatograph: Shimadzu Nexis GC-2030HNR2 or GC-2014HNR2
• Valving: Single 10-port switching valve
• Columns: One packed pre-column and one alumina capillary column
• Detector: Single-channel flame ionization detector (FID)
• Software: LabSolutions workstation with BTU and specific gravity calculation modules

Main Results and Discussion

The method reliably quantifies hydrocarbons from 0.001% up to 80% (CH4) and includes olefinic isomers and higher hydrocarbons up to C6+. Chromatograms demonstrate clear baseline separation of key components within a 10-minute runtime. Repeatability tests indicate high precision, supporting consistent quantification across concentration ranges.

Benefits and Practical Applications

Rapid analysis time and robust separation enable high-throughput sample processing in production and quality control laboratories. Integrated software calculations facilitate direct reporting of heating value and specific gravity. The method’s versatility allows monitoring of individual component concentrations for process optimization and regulatory compliance.

Future Trends and Potential Applications

Advancements in high-temperature columns and multidimensional GC could further enhance separation of heavier or more complex mixtures. Integration with automated sampling systems and real-time data analytics platforms may provide continuous gas composition monitoring for industrial plants and environmental applications.

Conclusion

The described gas chromatographic method offers a fast, reliable approach for comprehensive hydrocarbon analysis in natural gas streams. By combining efficient sample handling, selective column back-flushing, and FID detection, the system achieves precise quantification across a broad concentration range, supporting both research and industrial quality control needs.